Date of Award

1997

Degree Name

Exercise Science

College

College of Science

Type of Degree

M.S.

Document Type

Thesis

First Advisor

Terry Shepherd

Second Advisor

William Marley

Third Advisor

Wayne G. Taylor

Fourth Advisor

Leonard J. Deutsch

Abstract

The purpose of this study was to determine the effects of creatine supplementation on strength and power performance in well-trained football players. Twenty-one subjects were randomly assigned to three treatment groups: 1) creatine monohydrate, 2) creatine monohydrate+dextrose, or 3) placebo utilizing a double-blind design. Prior to assignment, subjects were matched according to lean body mass. After a five day loading dose, a maintenance dose was administered for 12 days. Test protocols included three anaerobic work bouts: l) two 30 s Wingate bike tests interspersed with five minutes recovery were used to ascertain relative and absolute power, 2) two 100 yard sprints with five minutes rest between each bout were used to determine times for 40, 60, and 100 yards sprints, 3) one repetition maximum (1 RM) and 70% 1 RM for the bench press were determinants for muscular strength and endurance. Over the 17 day study, an intense program which combined sprint and resistance training was employed. A two way ANOVA for repeated measures revealed non-significance for the effects of creatine on performance parameters at a 0.05 level of confidence. Within subjects training effects were significant for percent body fat (p<.01), 1RM (p><.001), peak anaerobic power (p><.01), and 100 yard sprint (p><.001). These findings suggest that creatine supplementation does not positively affect performance in previously trained football players. Supported by EAS. ><.01), 1 RM (p<.001), peak anaerobic power (p<.01), and 100 yard spring (p<.001). These findings suggest that creatine supplementation does not positively affect performance in previously trained football players.

Supported by EAS.

Subject(s)

Muscle strength – Research.

Athletes – Training of – Research.

Football players – Training of.

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